Francis ramsey



(No Model.)

F. RAMSEY.

SCREW PUNOHING PRESS. v v No. 247,407. Patented Sept. 20,1881.

em 1 xix I! awn/Ma UNITED STATES PATENT OFFICE.

FRANCIS RAMSEY, OF BROOKLYN, ASSIGNOR OF ONE-HALF TO CORNELIUS I H. DELAMATER AND GEORGE H. ROBINSON, BOTH OF NEW YORK, N. Y.

SCREW PUNCHlNG-PRESS.

SPECIFICATION formingpart of Letters Patent No. 247,407, dated September 20, 1881.

Application filed June 13, 1881. (No model.)

To all whom it may concern Be it known that I, FRANCIS RAMSEY, of the city of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Screw Punching-Presses, of which the following is a specification.

My invention is applicable to all punches or punching-presses in which the punch is forced to forward by a screw to which itis attached, and does not rotate with the screw. Its object is to reduce the friction of the screw upon the punch and so enable the screw to turn freely without turning the punch, and thereby rendering the latter liable to be broken.

To this end the invention consists in the combination, in a punch, of a frame and die, a screw, a punch fitting loosely in a socket in the screw, both the bottom of the socket and the inner end of the screw being concave, a thrust-block having convex surfaces fitting the bottom of the socket and the inner end of the punch, and a collar or cap-plate secured upon the end of the screw and fitting against a shoulder on the punch, to retain the latter in place, as particularly hereinafter described.

In the accompanying drawings, Figure 1 represents a side view, partly in section, of a screw-punch embodying my invention in which 0 the thrust block or piece consists of a sphere;

Fig. 2 represents a thrust block or piece consisting of a hemisphere, which is supported on a second hemisphere; and Fig. 3 represents a similar view to Fig. 2, but showing the hemi- 3 5 spherical thrust block or piece supported by a number of flat disks, which are, in turn, supported on a second hemisphere.

Similar letters of reference designate corresponding parts in all the figures.

Referring first to Fig. 1, A designates a casting, constituting the frame of the punch, and constructed with an opening or throat, A, adapted to receive the edge of a boiler-plate to be punched.

B designates the die, and G designates the punch, which is loosely fitted in a socket, a, in the end'of the screw 1), wherein it is held by a collar or annular cap, b, bearing against a shoulder, c, on the punch, and secured to the end of the screw D by screws d or otherwise. The screw D fits in a nut in the frame A, and has holes 6 in its head, in which a bar maybe inserted to turn it. The punch Oshownis what is known as a spiral shearing-punch, but any kind of punch might be substituted. The inner end of the punch O is concave, as clearly shown, as also is the bottom of the socket a in the screw D, thus forming between the two parts a spherical cavity, and between the end of the punch and the bottom of the socket in said cavityis placed a sphere, E, which serves as a thrust block or piece to receive the thrust of the screw upon the punch. The sphere may either turn with the screw or remain stationary with the punch, but in either case it greatly lessens the friction between the turning screw and the non-rotary punch. The concave inner end of the punch 0 forms a cavity or cup to retain oil when the punch is used in an upright position, as shown, and when inverted the oil is retained by the socket a.

In lieu of the thrust block or piece being spherical, it may be made in the form of a hemisphere, as shown at F, Fig. 2, and it may rest upon a second hemisphere, F, as in Fig. 2, or upon a fiatdisk,f, of which one or a number may be placed between the two hemispheres, F F, as shown in Fig.3.

In all the examples of my invention here shown the inner end of the punch is concave, and the thrust block or piece is correspondin gly convex, and while the spherical thrust block or piece shown in Fig. 1 may perhaps work with the least friction and be the most desirable, they all enable the oil to be retained 8 5 in the concave inner end of the punch when used in an upright position, as here shown.

The devices shown in Figs. 2 and 3 may each be considered as one thrust-block composed of two or several pieces. 9o

Vhat I claim as my invention,and desire to secure by Letters Patent, is

The combination of the frame A, the die B, the punch 0, having a concave inner end, and the shoulder c, the screw D, provided with a socket, a, having a concave bottom, the thrustblock having convex surfaces fitting the inner end of said punch and the bottom of the socket, and the collar or cap-plate b, secured to the end of the screw, and bearing against the shoulder a of the punch, substantially as specified.

FRANCIS RAMSEY. Witnesses:

FREDK. HAYNES, JOHN BECKER. 

